Recently, some peacekeeping forces have been tasked with combat operations, especially when the missions are deployed against non-state actors in the aftermath of internal armed conflicts. In the framework of these robust mandates, peacekeepers’ main responsibilities are to protect civilians and support the local central government in regaining full control over its territory. These robust mandates raise some issues regarding their compatibility with the principles at the basis of peacekeeping operations and their likely impact on jus post bellum. Furthermore, these mandates’ contribution to the achievement of a just peace is questionable. After briefly outlining the evolution of peacekeeping, this chapter explores the compatibility of robust mandates with jus post bellum principles and the pros and cons of robust mandates to reach a just and stable post-conflict arrangement, using the missions currently operating in the Democratic Republic of Congo, in Mali, and in South Sudan as case studies.